Saturday, 19 December 2020

GCHQ Christmas Puzzle

 

From this year's GCHQ Christmas Card. I had a go at this yesterday and solved it last night. But there is one of the sequences GMRDPR which I can't crack, and neither can William and Sarah. Any ideas?

Update: Got it now. It was a sequence I had considered but didn't start in the right place. Message me if you want to know the answers.

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